[turbofan] Add the RoundInt32ToFloat32 operator to turbofan.

src/compiler/arm/code-generator-arm.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/code-generator.h"
 
 #include "src/arm/macro-assembler-arm.h"
 #include "src/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
@@ skipping 813 matching lines @@
     case kArmVcvtF32F64: {
       __ vcvt_f32_f64(i.OutputFloat32Register(), i.InputFloat64Register(0));
       DCHECK_EQ(LeaveCC, i.OutputSBit());
       break;
     }
     case kArmVcvtF64F32: {
       __ vcvt_f64_f32(i.OutputFloat64Register(), i.InputFloat32Register(0));
       DCHECK_EQ(LeaveCC, i.OutputSBit());
       break;
     }
+    case kArmVcvtF32S32: {
+      SwVfpRegister scratch = kScratchDoubleReg.low();
+      __ vmov(scratch, i.InputRegister(0));
+      __ vcvt_f32_s32(i.OutputFloat32Register(), scratch);
+      DCHECK_EQ(LeaveCC, i.OutputSBit());
+      break;
+    }
     case kArmVcvtF64S32: {
       SwVfpRegister scratch = kScratchDoubleReg.low();
       __ vmov(scratch, i.InputRegister(0));
       __ vcvt_f64_s32(i.OutputFloat64Register(), scratch);
       DCHECK_EQ(LeaveCC, i.OutputSBit());
       break;
     }
     case kArmVcvtF64U32: {
       SwVfpRegister scratch = kScratchDoubleReg.low();
       __ vmov(scratch, i.InputRegister(0));
@@ skipping 533 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8